Combined grate and air-heater.



, A, D. RATHBONE. COMBINED GRATB AND AIR HEATER.

APPLICATION FILED mm: 15, 1905.

Patented Oct. 27., 1908.

2 SEEETfi-SHEET 1.

\ v \s 0 NBWMW' A. D. RATHBONE. COMBINED, GRATE AND AIR HEATER.

V APPLICATION FILED JUNE 15, 1905. 902,002. Patented Oct. 27, 1908. 2SHEBTSv-SHEET 2.

mulllllllllml mum MQ M ALFRED D. RATHBONE, OF GRAND RAPIDS, MICHIGAN.

COMBINED GRA'IE AND AIR-HEATER.

Specification of Letters Patent.

Patented Oct. 27, 1908.

Application filed June 15, 1905. Serial No. 265,302.

To all whom it may concern:

Be it known that I, ALFRED D. RATHBONE, a citizen of the United States,residing at Grand Rapids, in the county of Kent and State of Michigan,have invented certain new and useful Improvements in a Combined Grateand Air-Heater; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to improvements in a combined grate and air heater;and its object is to simplify the construction; to provide a deviceeasily taken apart, or assembled; and to provide the same with variousnew and useful features hereinafter more fully described andparticularly pointed out in the claims, reference being had to theaccompanying drawings, in which:

Figure 1. is a front elevation of a device embodying my invention withthe ornamental front removed; Fig. 2. a vertical section of the same onthe line 22 of Fig. 1; Fig. 3. a horizontal section of the same on theline 38 of Figs. 1 and 2; Fig. 4. a vertical section of the same on theline 4-4 of Fig. 2; Fig. 5. a side elevation of the same with one of theside plates removed; and, Fig. 6. a plan view of the same with the topplate removed.

Like numbers refer to like parts in all of the figures.

The outer case is preferably of cast iron plates as follows: 1 is theback plate 1 are side plates; 1 the upper front plate; 1 the lower frontplate; 1 side front plates; 1 the top plate and 1 the bottom plate.

The front outline of this case is rectangular, and the case is madenarrower and lower at the rear than at the front. The air to be heatedis admitted to the case through side openings 2 near the bottom andfront thereof, and circulates upward, around and between the variousinternal parts of the device hereinafter described, and escapes eitherthrough a front opening 3 into the room where the device is coated, oris conducted by a pipe to an upper room by removing the p ate 4 which 0oses an opening in the top plate 1 and connecting a suitable pipe withthis opening. In the middle front portion of this case is located anopen front fire box 5 consisting of a casting having a vertical andforwardly inclined back portion and forwardly extended side portionsflanged at their front edges and bolted to the front side plates 1.Engaging these side portions and arranged in front of the lower frontpart of the fire box is a front grate 6, and at the bottom of the firebox is a bottom grate 7 provided with pivots 8 at its ends and pivotallysupported thereby upon a frame 21 extending beneath the pivots andacross at the rear of the grate and provided with lugs 22 to engage andsupport the front of the grate and permit the grate to be tilteddownward at the rear to dump the fire. This frame 21 and the fire box 5are supported upon the top of the ash pit 10, which ash pit consists ofa bottom, back and ends, cast integrally, and having an open front sideclosed by an ornamental front through which air is admitted below thegrate, (not shown). This ash pit is supported u on a bottom chamber 18arranged in the ower part of the case and extending from front to rearof the same and is bolted to the fire-box as indicated in Fig. '5. Inthe bottom of this ash pit near the rear thereof is an opening fordumping the contents of the ash pit and closed by a slide 11, whichslide may be withdrawn by means of a handle 12 connected thereto andprojecting at the front of the device.

The front of the chamber 18 is provided with a clean-out opening closedby a removable plate 14. Extending from beneath the openmg in the ashpit 10, downward and rearward through the bottom chamber 18, is a chute13 having its upper and rear inclined surface provided with numerousopenings 13 for the escape of dust'or gas that arises from the ashes andcinders when dumped. At the rear of the case and opening into the rearof the bottom chamber 18 are vertical fiues 1 6 and 17 formed by aflueplate 23 having rearwardly extended side portions extending to the backplate 1 of the case, and a middle partition 24. extending from the plate1 to the plate 23. This plate 24. is prolonged downward within thechamber 18 as at 24 and extends forward to the chute 13.

Mounted on the top plate is a collar 20 to which a pipe may be connectedto carry away the smoke. This collar is ermanently connected with theflue 16. xtending from the top of the fire box rearward to thesevertical flues l6 and 17 and connected thereto by openings 25 and 26 isa top flue 15 provided with a damper 19 to close or openthe opening 25,as occasion requires.

This damper is operated by the rod 27 ex tending through the front plate1*. Beneath the grate and slidable toward and from the front thereof isa T-shaped slice 9 mov able in ways 9 on the under side of the grate andsupported thereby. This slice is provided with a row of upwardlyprojecting teeth 9 extending between the bars of the grate and above thesame a short distance, whereby the fuel may be agitated and shaken downas occasion requires by any suitable handle'or hook attached to theslice. This grate and slice will turn on the pivots 8 downward at therear and upward at the front and thus dump the contents of the fire boxinto the ash pit, from whence said contents may be discharged downwardthrough the chute 13 by withdrawing the slide 11. The dust and gasarising from the ashes and cinders will escape upward through theopenings 13 and be drawn up the flue 16 into the chimney.

When the damper 19 is open, the draft is directly up into the chimneythrough the opening 25 and collar 20. When the damper 19 is closed, thehot products of combustion pass through the opening 26 down the flue 17,forward in the bottom chamber 18, around the front side of the chute 13,and thence rearward in the chamber 18, and up the flue 16 to thechimney. The bottom chamber, ash pit, fire box, rear flues, and top fluethus provide heating surfaces to heat the air entering at the openings 2and escaping at the o ening 3 or 4.

It will also be noted that the described structure is so organized as tobe readily assembled or taken apart and that any one or more of theplates forming the case can be independently removed, or that the firebox or any other of the inner portions of the device can easily beremoved and replaced for repairs without disturbing the other parts. Forthis purpose the bottom plate is inclined upward and outward near themargins and thence flanged downward and outward at the edges to receiveand sup ort the back, sides and lower front. This a so strengthens thebottom plate and affords a channel in which the nuts or bolts areaccessibly located. These parts are separably secured to this flange bybolts. The back at each side is provided with inset edges, to which theedges of the ends are secured by bolts. The front portions are eachseparately secured to inturned flanges on the ends. The flue plate 23 isflanged at the edges and the plate 24 is held in place by lugs and ribson the back and flue plate without other fastening. The ash pit 1O restson the bottom chamber without being fastened thereto, and supports thefire-box, which is open at the top and slides between flanges on theopen end of the flue 15 and is not otherwise secured thereto. Thus bydetaching the side front plates 1 and the plate next below the same, thefire-box and ash pit can be taken out, or replaced. The flue 15 isflanged and bolted at the rear to the flue plate 23 and at the front inlike manner to the upper front plate 1*. By removing this plate, thisflue can be taken out without disturbing the other parts. In likemanner, the back or end plates may severally be detached or replacedwithout disturbing the other parts.

The device is also readily assembled by beginning at the rear and addingthe various parts toward the front or taken apart in reverse order.

The ash pan construction herein shown is reserved for a divisionalapplication in accordance with the requirement of the office fordivision.

Having thus fully described my invention, what I claim and desire tosecure by Letters Patent is:

1. In a heater, a casing, a firebox, an ashpit having a downward andforwardly inclined wall, a chamber beneath the ash-pit, a fluecommunicating with the fire-box and the chamber, a chute communicatingwith ber, said chute having perforations in its side toward the flue, anash pit above the chute, a slide to close the upper end of the chute, afirebox above the ash pit, a top flue connect ing the fire-box with bothsides of the rear flue, means for connecting one side of the rear fluewith a chimney, and a damper to disconnect the top flue and the otherside of the rear flue.

3. The combination of a case, a bottom chamber in the case, an ash pitabove said chamber and having a bottom opening, a slide to open andclose said opening, a chute extending downward from said opening throughthe bottom chamber and having openings in its rear side, a gratepivotally supported above the ash pit and adapted to turn downward atthe rear and upward at the front, a fire box above said grate, verticalflues extending upward from the rear of the bottom chamber and apartition between said flues and extending within the rear of the bottomchamber and to said chute, a top flue connecting the fire box and thevertical flues and a damper and collar connected to one of the verticalflues.

inlet and exit of air, a bottom chamber ex' tending from front to rearof the case, a verits bottom a slide at the bottom of the ashtical flueplate extending upward from the pit to operate over said ash-pitopening, bottom chamber and having rearwardly ex- I a grate pivotallysupported above the ash tended sides flanged and bolted to the rear lpit, a fire box above the grate, a top flue of the case, a partitionextending from the connecting the flre box with openings 1n the flueplate to the rear of the case and within flue plate at each side of thepartition, and a the rear portion of the bottom chamber, an damper toclose one of said openings.

ash pit mounted on the bottom chamber, a In testimony whereof I aflix mysignature chute extending from the ash pit downward in presence of twowitnesses.

through the bottom chamber and provided ALFRED D. RATHBONE. withopenings to permit dust to pass from Witnesses:

the chute during the passage of ashes through LUTHER V. MoUL'roN,

the latter, the ash-pit having.an opening in GEORGIANA OHAoE.

